FIX: apply correct _FillValues and lessen tolerance when reindexing arrays, check `secname` before `fillna`

FIX: do not test srtm downloads in pull requests due to missing secrets

FIX: use earthdata login to download srtm data

FIX: polygon issues with gdal

MNT: address numpy 1.20 deprecation warnings

MNT: prepare io.xarray for forthcoming backend changes

FIX: vpr-module (#478)

* FIX: vpr example in documentation
* ENH: add capability to call interpolator with additional kwargs
* FIX: make vpr example in documentation run by doctest
* MNT: pytest-xdist run all tests from one file on same worker

MNT: move CI to GitHub Actions (#477)

FIX: set fetch-depth 0

ENH: upload to testpypi and pypi on release (#476)

MIN: trigger readthedocs on push (#475)

MIN: trigger readthedocs on pr merge

MIN: add semver to requirements_devel.txt

MIN: use pytest-xdist with GHA

FIX: handle kwarg change in scipy.cKDTree

ENH: enable GitHub Actions Workflow

MNT: Rel 1.9.0

MNT: add wetterdienst to notebook/test dependencies (#472)

Read truncated radolan (#471)

* radolan composite: fill missing bytes if requested
* MIN: adapt truncation fill workflow, add tests
Co-authored-by: franzmueller <franzmueller@users.noreply.github.com>

MNT: micromamba on windows CI (#470)